Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c3939c2f22138c69e65260a284c7f99d91e0672c24b3e07a53cd11c043d15e' 
  AND token = 'r/395umveNiGkCQKezFbWXfWTc8oFGvAJrQs7tIHvyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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