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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9458c444d7687aa5fa57c5713e9e4759535c8038f75729ce4d01495b0971e5b' 
  AND token = 'Mk+SRo2MHouvLQJ0v0/BO3/RaJocJsrQJzytxrbSoIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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