SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d44a4c6d9a2a9b42585d6a19f2f2767714eb8ad6c3bf6e1162e3c690bc76922' 
  AND token = '02UgJ7IF+qLv/+kpcwQ1rOWJnrg58RtA9eLKjfGSP0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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