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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366568ae2f0e3ac850f961d682b48dc5f077e71e8cc50d696e8e84e6d48648ab' 
  AND token = 'gp3P4Wa7PtakjpabN+rfnbiMVfMP9pQTkOZbQmEoqyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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