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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46e58e55dbb48307d98eee673f1eb4e1270c4462874e059ab2eb5cca8ab6ba2' 
  AND token = 'v+AFnhCjyJ0uanycy5sA0MqcCmn8HYmONq571mIRcaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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