Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b319b2c347a230f8156daf102c6545208db35da990d3dadf9062fb33b820447' 
  AND token = 'xg+hGE4Y0djQLJCartATbrjc5JiM0s3xgtXZQdMXKT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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