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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eadeea3db8dec76891bd47b47d5be3579ed3ab2b64ed243771d9a6009d2719' 
  AND token = 'p6Sh83idAwxy51t9WEfwbcnvVT+XwaUgImks+H449Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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