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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb962d2d8bbf1a9998f12052ddcea8f9d94eaf672ad28f78633cb95dad3e8a84' 
  AND token = '2dcCpPNDvFLLcKdjklxk8DhyQR9UKHChPldyaRL9ZXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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