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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28ad03b99a9b27af078e0c8ef4b8cba824111f96708a4b95755a0a40beae8db' 
  AND token = 'J1tWaZuD70nJK6XE1xYAXNf5a4WptC0rehAqt6Lufjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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