SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5429f3f92d3b7aa0bc4cef044fa926c7ee88ebd3ec7adc957e0acd2a34967a' 
  AND token = '8l9F7f8Z/7Sjp+KNmHqa0XTVZ15qH5P9nhYBYwfvqvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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