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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d645895f0d4e645bb2f261faa1e12b7e558d8245cfb396249ce1b19cf44b7bf' 
  AND token = 'JrJDtOMX6TUUkjQq/JZrKKwaBOXXsx2ea0EB/r7AiVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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