Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548ad4f241e79edb4de15ec405d65ba41d878a2b9a797b06c9d47068ccfd1664' 
  AND token = 'dAtwLzeP6sStVayPkwGORi3nST271FtO+MQtzGVjQng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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