Performance Issue on a table

Dear Team,

Recently we have noticed that in one of our DB instances there is a potential delay in querying a table from java code. could you please check the attached log and help understand what is the problem and which direction should be look into solving this delay of 4 odd mins ?

The table definition is as below, it contains around 2 billion rows.

create table "TAFJ_HASHLOCKS" (recid integer);
alter table "TAFJ_HASHLOCKS" add constraint "TAFJ_HASHLOCKS_PK" PRIMARY KEY (recid);

Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl execute
FINEST: simple execute, handler=org(dot)postgresql(dot)jdbc(dot)PgStatement$StatementResultHandler(at)13e344d, maxRows=0, fetchSize=0, flags=1
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl sendSimpleQuery
FINEST: FE=> SimpleQuery(query="SAVEPOINT PGJDBC_AUTOSAVE")
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl sendParse
FINEST: FE=> Parse(stmt=null,query="SELECT RECID FROM TAFJ_HASHLOCKS WHERE RECID = $1 FOR UPDATE NOWAIT ",oids={1043})
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl sendBind
FINEST: FE=> Bind(stmt=null,portal=null,$1=<'256292129'>,type=VARCHAR)
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl sendDescribePortal
FINEST: FE=> Describe(portal=null)
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl sendExecute
FINEST: FE=> Execute(portal=null,limit=0)
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl sendSync
FINEST: FE=> Sync
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl receiveCommandStatus
FINEST: <=BE CommandStatus(RELEASE)
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl receiveRFQ
FINEST: <=BE ReadyForQuery(T)
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl receiveCommandStatus
FINEST: <=BE CommandStatus(SAVEPOINT)
Jul 22, 2021 4:25:00 PM org.postgresql.core.v3.QueryExecutorImpl receiveRFQ
FINEST: <=BE ReadyForQuery(T)
Jul 22, 2021 4:29:20 PM org.postgresql.core.v3.QueryExecutorImpl processResults
FINEST: <=BE ParseComplete [null]
Jul 22, 2021 4:29:20 PM org.postgresql.core.v3.QueryExecutorImpl processResults
FINEST: <=BE BindComplete [unnamed]
Jul 22, 2021 4:29:20 PM org.postgresql.core.v3.QueryExecutorImpl receiveFields
FINEST: <=BE RowDescription(1)

Thanks

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