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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef035ad8c732fb79e2fefacdc657d891cedbd96b4153b508d3fc8f8f2f1275f' 
  AND token = 'ynTbNIwxmI5sm03K/3aVws4ZzVw7sUUEvxnZb0alSJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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