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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be5c3ce3679c4f87f735e0763a925393aaa9316f4b770aca992855bb7580077' 
  AND token = 'vktT/0k+adZNPpcv4Kfczril/oqYgyZOJyU+RTJEUv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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