SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7395fb97722ab0c186c7157e9d17db2d1cb03a3cb271b9615f2e3693fd1483' 
  AND token = 'WE43BqBZ4hKJYrlzTJW6ob0wkbgOzLy8aJGFVfVaKRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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