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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6030db8cb17116fd47a008f24961142d212039ce41921c50f98e776f15870909' 
  AND token = 'xK7ObH9MkuefJY0HiTR/0iDYGL+oZ0CFpE5LVj70KMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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