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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b29e979536ab903791e65d1a4bbd5f21198d0cc347e9425fb22f970f803756' 
  AND token = 'jm07/n6gNLADPIFQktpAlosQsc9Z7cpD3c4ozAtH28A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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