index not used

Hi folks,


I'm doing a simple lookup in a small table by an unique id, and I'm
wondering, why explains tells me seqscan is used instead the key.

The table looks like:

    id	bigint		primary key,
    a	varchar,
    b	varchar,
    c 	varchar
    
and I'm quering: select * from foo where id = 2;

I've got only 15 records in this table, but I wanna have it as 
fast as possible since its used (as a map between IDs and names) 
for larger queries.


thx
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