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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4c408d18db0959cc826c3c66486a036b098d6ca277dd140ea83e6f673f3c93' 
  AND token = '+0LfXsZ3ej5iLLj86LUXi9G3shR6uQVa+IioyLumi80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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