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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2710ccaf68dbff44931e11d854ecb6b78cbd352c6ea75d70bcaa9f5ffa2a4b79' 
  AND token = 's+D+HPB9n0RJ2xFmKr+5w+DQrIyhhX5x7rL/kc9mW/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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