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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7aefa211ddc04fee6aa95970f5ba1a35aaf1b8ab76ba23084ccd4c29db520e1' 
  AND token = '+dS390EWi9FP0XTx9H3NRPhE6PDo4n2hj2GO1tpFL+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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