Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5068f57c1e22b39566037594ee2ae521980a5db2ac74644852e96597bb7326ba' 
  AND token = 'h+ZcvbZlk3AN7r9u1ODejOeiDkJNM0o8TkaDxFu/OTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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