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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be1a61b84bfe19cf322a781e783cb2e7c5b159c1d8a6bd787faa31d00c444b5' 
  AND token = 'JHGBjMn4tSX4NYsp8Fwupaq8SMk7jhGowGGRd7J7iIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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