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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867f538de0f63bceb323cf7990a96921356efd5957374a60cb358fefbb25e3fa' 
  AND token = 'X/MXt6WNsBPDXU73zYHmtD5W7Kriygd04ddR6J6facM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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