SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc228020eb64203c2d3b245de0826f8bb06cfded3fba104a47882b9fbd50f356' 
  AND token = '/b6FqPaZf9PJhRzXclRqGp+GggtCxRWm9E3IAv3WUQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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