SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd598d6cb5dc6099242aac4a470824243a2eb7ef39ee00a03178fb77f93a4ae67' 
  AND token = 'oA+UksgRK+CUPvJLeL05GeOlZwFurPG7ndmkqwX0Vl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}