SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 10106 
  AND combination_hash = '435738575'

Query time 0.00026

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
10106 PIR-BT-020-A-FIT 435738575 650_15459_652_15486_653_15488 0.00 N 0 44.00 24000.00 1 0 17.28 0 0