SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccea25f5946bee217f92f50b68253763207a2c5fe8767ccf169379bfb2dc1e80' 
  AND token = 'DbJRhjo/Mmnj4HiTcN/Wz95VpsL5OuJ4uGjzXYXhpIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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