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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cf0ec24dc719469796386bb7c187fc95e65294aaf4a10e0a77c1d47f171752' 
  AND token = '3KYp7bTKLxh64Et2wyzNbWnI5U451nKe+JjfBHAVDbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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