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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6557c10f7dd2ff1e6b4a9ea65872be639cb6ef6fa96d55616bd2fe7663c51c7e' 
  AND token = '2odVG8O79Ch378nR++ph7w0TMhd9NPpaI8kOr/wUl58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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