SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e6e28883ebbf4c878ddd1bc5b492f0062c39896a18e6d75da6ba5a2f93c929' 
  AND token = 'vow0Ig2JtLcPXSXmJtjZDoHNHFG1gvsIUEQFKW5BzrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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