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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a70f0c1d052926221ec18801b7d5f7c2ea72b9ec87fd11c57eb9a927d50d9fa' 
  AND token = 'eKF9k+4hFf3QTizyEPwgezmggpKBhzM94j9w05xj4Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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