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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b7d0ef172861e0fa96fdafb987ff9fc579bf6a594f1c3bb486aa9c6994fd30' 
  AND token = '2wGa2G6R69iFR0uE1AFIU1YeGbxZN5s5+8Bey3svP+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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