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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb460d1e68eef09b18d2aeac5f7dbcff410405b5cbef3a4132bb56a6605b4031' 
  AND token = 'yddsKKcDRjA/BE2YjDF7aQord+3peS2KSBxmXaJrMmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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