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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5bfe7aa7c49d08b4281781bba4c439c656fd30ae0ba0cee78579e9eb6287a8' 
  AND token = '7IdlUx7TnNaK9AQrMJy4k/bY35YXWZHY0PcDhtOlTYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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