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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caf6474ee4d286253c43b4d4a8edff311bc17b1b17e1aac1ccc2b3b7177fe0a' 
  AND token = '6Ts61Zfkz2tRpLs6XmUCBgMe01x7ZuuTCVlekNXeMio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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