SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de0706e6324fb41d7c1757f0af29dc0a6214e55ae912bfc4d2b98163372c1fc' 
  AND token = 'CiXjJ4VwyKQ2Mb/XG9z+cxMbZC6syWhMkcjeFQpzxWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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