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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc563c573a4a8e78b4d6795150b4dc2823fd128441575a56c7574ddd0b9684b' 
  AND token = 'Zb6TfRCKXIZJ4Hwk2ctTg1if9ZHN4z+z6CeNEuwU0no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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