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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961b1c1de47752418b6581e88d85f323d57014f4b3fa580d0275fa86408f9093' 
  AND token = 'ky0UL88u/0doMFXg61HuwCuuxr8yTW1IAPXxAmROJtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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