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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1d5ed4a7608ff262c4b1694ae1fbcd3e1b7ca4bd608e06f49dc0cc17a76c58' 
  AND token = 'XoJJVgYzuWdfjffDUQ+7LSu8WMSotN/Wd5lJCvHF5eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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