SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbc89d6637135951c64bbc2c8975c5ff817fed5b567fe70b125ebc102fdf926' 
  AND token = 'a2qr2drGwqsAu+WEEOwv/ljYJOnTmrTTt+YB8qaK/vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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