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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c4bc7032706874366f1b86f9ca356904595728c9ed69095b2f3b9dddd354a7' 
  AND token = '2HoAUQsb9ZSvDKdCZG1e4hNnI4l4ifDQ64K9ZIevwuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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