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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdffc5f50dcb77bd7dc31bf0f24f0a6f4f7b95f63af265288a4ad02df17f5637' 
  AND token = 'V5DviCW9+U41X5I8GRvXXOlDechtXM/0QXt8KSSKDks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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