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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6089b66c6af603e900727ce2257d9903fb7db3c7db9c3f23b828853a4166c901' 
  AND token = 'lmdp23yGRVKVs8TZzhPcGSJEzq6oLk9t7vre7L5Pv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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