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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b42dd58fd5d31c416c70e55d01671b4ab8b36c79bde0834b96509128eb45b4' 
  AND token = 'kjJoGZ5QssG8rrUzIMnzDlILpkiZPcwbXC8Q0XW/B5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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