SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2393afd01f65660080e67f766d2b51076bba28c1983b37df78b7ea40076a07' 
  AND token = 'iK9bJhiBkCceXGFuCSQOwVWPiqPhg4oqqYtW6pDH3ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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