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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71921b34c9ceaac0de72543b97b8de73220f6c79ef984d6bbe079da66d96d7af' 
  AND token = 'ee36OtLWtPF1z4LvixIYmZJKfAaqUzUEY9uA2Q7vYAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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