SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d0060ac598fd9835111bbef8473302e5382ca4619d0a9154ebf6ae5ae8f37c' 
  AND token = '9I6szZZRTZUnX8ndBLCjYdXHWKzq71bJorsjfmJgJSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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