SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13723d9710a021fd27ebe74974bc2fb762db78b951f96b604e6d2a7ea8591222' 
  AND token = 'n+gHLOzz8PUG68CVoiRF4AwAsS2Q8/Z+oxG798Oi3YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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