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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2ce7829ac4ea795b3ae979d86a7dc44a09a1ac12f2b6dfdead8e7b43147656' 
  AND token = '//Xq/ypNH5BjsGeuHu6ykhCusEFZCXkZ1YrTuf8jMIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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