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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e623e38772c0da8b01f80711b676278f59f10cdd37a8ac1e406c23c83503eb2b' 
  AND token = '97ujAZ1vmqudpVkwUEm+3qoYBd2RUzEEr6dRdsvTJB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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