SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 8295 
  AND combination_hash = '1744885951'

Query time 0.00021

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
8295 ATR-OID88880511 1744885951 1222_22801_1223_22807 30.00 N 0 268.80 2.00 0 0 0 0 1