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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f19978cd198c304759f3b772247ab9c358880c622ee229f9d0f27e4fd7ef578' 
  AND token = 'PN3pyO2cV+uhHHdxh+7rQZ4HRhYB/pmk0rJgLEYl9gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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