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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56f5c6fd39233f374d26829a044ddad0d0a222ad7be2ed381f808d5a6b25812' 
  AND token = 'ClJzJh9vYipTdtxJg+mB8bBLIa+Fk1/+4SonSTuAQUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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