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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d7a17e5e6f0c15bf8361b7eb85b0a9569df8e89b680314a559a7369848d2f8' 
  AND token = 'aDJr8jw93e3zy7BbPbyolpgd4l+pZavUKcCDMexDWzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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