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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba466368572e15d099f776243eb7584d3cef74127a6f6a5af6e26dd76d25db2' 
  AND token = 'bygRbfn7D0LTOWryeED6pS5pWRvWhQzR0Lk4dzS9kKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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