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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cc19b1b50e5eaa0b23f8e653ea0a06009266a7d0d7f58a6fb04a4a85d8b8d9' 
  AND token = 'wjWt5MAst0HgrhaL91pH4v4++Qr5dSzdL0kRmSc8IIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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