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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62661dbf1d84a196a4647375c6f51f2a491d2172716e90d5913ff74b8247130f' 
  AND token = 'b/udzxAU8dpC2atcYuHEHlJBFa0o5PpxIlR88wAuO/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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