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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f430999b1f5907a76375fdf6ed1895fe0a64a6ee7b64433ec2ce7f7e0e4cc9d' 
  AND token = '2LaOKUQMhAYMd3P1wYePVfSCiY3/sX+akFrZmwE/gsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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