-> Index Scan using visits_created_at_index on visits (cost=0.00..7026.59 rows=131373 width=4) (actual time=0.037..162.047 rows=131311 loops=1)
Index Cond: ((created_at >= '2013-01-15 00:00:00'::timestamp without time zone) AND (created_at < '2013-01-16 00:00:00'::timestamp without time zone))
-> Index Scan using views_visit_id_visit_buoy_index on views (cost=0.00..766120.99 rows=6126002 width=8) (actual time=18.960..140565.130 rows=4014837 loops=1)