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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97af379036b4e74c37a7c9ef951a54663ae319822e097c84849ab96f5f805b7' 
  AND token = 'BKUBeabng0Y4G84IRpXR0pZWg8vteNgtjs0WY18cnZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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