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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f2dbf0d06e4088dc92a77445467f65f93a7c69337d0e7c6b353d9fb6e58721' 
  AND token = '6XaEYSN9qReePjfOLrHfIh3NIXMGUuEQWc90j71mzfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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