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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111fff8120e4e0f6b96c1c04d770caf23956e5eafb9402148f97b4647cb3e976' 
  AND token = 'XX1jg5+0YhxHN+n22KQMxnWQ+5fpwWXi1GMZne+Md6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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