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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbed779c0c5350596f0873e5011d03d5316370f376de2d44b5105b40e64ceb4' 
  AND token = 'xwS5v/K+sGWQExeWJzsnSUtopze1OgyakgkY1dBnZYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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