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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2ad3c8609111d3931e2db736795350b66bb8ad24aa183007decf63274eab95' 
  AND token = 'DpL7tTMfex3a3GLIrU6X+WAzL+Eq7f+cO0p3U9JH4uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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