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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398489b49d5512271fe9931b86e641d995fc7c3a6c27b01d644d0e1e9b02e665' 
  AND token = 'C0sMTQ0KvEwHQu4lLz3LqoLhvSgdAofl3NCvhGcTwzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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