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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a4a9c89305ecf10d6450f5f146ef756d8cd2138e7514781f1a747f656e2c64' 
  AND token = '1N5X+ytAAxwoLlhYqdrz+yvjFKqxWiIKz4lwTwe5stg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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