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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ac9d14e0e6348dd918efc241e4620de40174c0c3a046c5220dbc83396106ed' 
  AND token = 'zazSAzy2dPCp4uboN7a2ip3zweXwhqaLpa1e5fYUtzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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