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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1a56c0cd100a9a4f6861ea7ffbe7e9be6cf6ea70ff5f64c56a52416a3f72a9' 
  AND token = 'K5cXNT11/Ri+o9Cyj7IVQbkSEsryDAdBEIH3B0aExOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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