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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175b3f9d6fb4eddc4a81c6cb27ce2cc2fff78ab8154788db02747266065ae2e9' 
  AND token = '+Y18NVUExLz/ir7u58NKWtKOioH4e4wELhB3pRHbhes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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