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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a269f3d161c779e84e58b5359a77c462ee6abdcc261315116935d9edf0e2bf86' 
  AND token = '1H9yIsawlrfv3WxW8HL27E6zYHFpJ3uRzruYelFt8QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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