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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4139f78695e095838c57b5ca6a6bf68ac4e74a6eb71378092d36dff03ded98' 
  AND token = '7PK8epE4YCQO5O2/M71o9DWQpgSS+WjDhhmGu37a418=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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