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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cf59861cff139edf216bf9eee3b31ebf4fcef75065cb1d97a514ed0a972f77' 
  AND token = 'yuw9F2iz8XkwnGIdbM814K0vmYfMynLvauT/zCzfG6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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