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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ae4211823db222936832465bd29fc89fbce254a9b19bf2437552672faaec6e' 
  AND token = 'L2LnWivbXa4oGaLS+xwLxTU/6q5znBJfA+nlq2e/YN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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