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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16342abb2c4ffb32d139e422b94a8bce25d21960482dbf1cd6f37033376906d' 
  AND token = '0NkIi6sZMzTebGwGabqmaaTNtIp3jlg4jf0mR32iSns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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