SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f65812b2186c8655bee71f57d42e47b4982326bcb94a60f42be62f533ca555' 
  AND token = 'lgfe0J8QsvIXextgsqBENcy0om3J3K+z1uGNOQLP6zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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