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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda9b0635b68e69952a9d814ea642f356bcec580cc4045ca2bd956c5bb0650a3' 
  AND token = '8L+agjr1ui44Ps4Z77LoZLBRVng82DLB6gfioGMCe3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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