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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cee0831735ef980020e1b7f4094a982cd6fb852c7e02cd54a5810fa07aedbf' 
  AND token = 'OPytN51yQEGHz2PwG++ocbVmfrDzBDbmvzWCzQ8sYvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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