very slow query

Hi,
I am having PostgreSQL 8.2.4 on Suse 10.3

Server is not using the index insted it chooses to take seq scan path. table is having @ 120 million rows

here is the output from planner:
Nested Loop IN Join (cost=0.00..5030217.97 rows=2 width=106)
-> Seq Scan on sms_new (cost=0.00..5027902.00 rows=384 width=106)
Filter: (mobile = 919820920858::bigint)
-> Index Scan using deliveryid_pkey on delivery (cost=0.00..6.02 rows=1 width=8)
Index Cond: ("outer".deliveryid = delivery.deliveryid)
Filter: ((createddate > '2007-12-11 00:00:00'::timestamp without time zone) AND (createddate < '2007-12-11 21:00:00'::timestamp without time zone) AND ((keyword)::text = 'CRI'::text))

column deliveryid has an index over it in sms_new table.

can anybody please guide to force the usage of index

Thanks in advance
With Regards
Ashish

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