SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 8314 
  AND combination_hash = '1958130467'

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
8314 sol-pp4-060-115 1958130467 438_11845 -31.02 N 0 47.21 25000.00 1 0 15.51 0 0