SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 10967 
  AND combination_hash = '2034270182'

Query time 0.00020

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
10967 ATR-TFX-F6A 2034270182 1323_24005_1322_23999 3.00 N 14 208.52 15.50 0 0 0 0 117