SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf5edb1f10043672fe13c9c52e38c98edadec25ba184138b2d71ff7a73010e0' 
  AND token = 'lpHhVLab7RR+aq7QWp+lhMytcDD9fe0R4ANFWOvduz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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