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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697dc592698b96e3c5cd9ffc97a1a405296c1e807cb191892e731565cab61566' 
  AND token = '5XYzLh3G8R/7k3T7UU8jiCAzl7OEV8UvTXmlb3mv/Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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