SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3078594f0476d9e36b93831427a921831dc0151b7837830a334df254119b6119' 
  AND token = 'pfu0Ja6xjYyO87VzjJY+mqn7Ic/4Ok08xwb/GPIb2FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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