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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1ba591d682030b1833a6a91fb7c9fb5cfe62e9eacd53ebd95168046b07e0dd' 
  AND token = 'kXU7gcuD8TFRjElDwDx4aUZdGJxnV5FDX+nzD6Hf0ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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