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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f373895b0e461b8d11c0dc84cf7e30ec7e538b702946149bb96987cdc6be74' 
  AND token = 'uh0UiwEU61JEVc5EJJlP8FmtspiHboMi0Jo9wS24LZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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