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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2144c45e7d21d9698c908444c31e046bea26d7ed9090fd773f4635d28ca4de' 
  AND token = 'EKfiyhH6e3m5rHyKMNX2Td1UTJzxeiXzL0J9ZXv1JPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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