SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 9851 
  AND combination_hash = '3622852424'

Query time 0.00022

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_options_inventory const PRIMARY,pc PRIMARY 4 const 1

Result

product_id product_code combination_hash combination amount temp position price weight min_qty max_qty qty_step list_qty_count aval_status
9851 ODV-FHC-C01-1045S 3622852424 1262_23325_1260_23290_1155_21886 0.00 N 0 395.12 2.00 0 0 0 0 15