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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38814ae5fdf43b4bb769d8a8c5332050399e8d0cb0da1fc3c1c0932e9053d8d2' 
  AND token = 'rqm4zdTp5r51mrAdGVhelPnVxZSppB54vwum+J9NlVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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