SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e288e99af55ad79aca405f3e28d6130d434f58097380e250b60c90ea65897cd' 
  AND token = '7AP1FZ1MUSeQojX/hPBfo/QwpRmrBk6SvEYXFbg1V1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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