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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5dd08948fdecb84c5bfe9ce70cb06a1fd0c50a25fbbe7bb6c455d62bd218a6' 
  AND token = 'LOo80U44HwotDH2fv2ufbBg2bfCkH1dSjfyf01jpruw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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