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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f27884a6fde384041ab33049fadb83f6df21a650db84fe1e3dea8e8e6f42ebe' 
  AND token = 'Q7jPZzmcNL/Vq923iF4BL7kujIZuMEBzzJxnZo43lKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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