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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aee0ad6dd10299bd029a1e9c6318ee77bf00398add1c29557978af0dcdd7873' 
  AND token = 'wMc8lLxVfDbKAWE57nFtof3J3Y5pljOz0pIbZVge8VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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