SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c59eb931995dd49570cd7b1b491585dffaf4f9c6cf7901344e4e291677c32f6' 
  AND token = 'm8H+joS3VqrKeL3PQsoAGqwGTXoIiJ1p7a3TOgW/sE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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