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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cdfd72c46b5a2a4a76913374a8f2f028d5ae1da6e6041017c3e537ce4c3cf1' 
  AND token = 'aIkesVwjVqfLQJUHljZnEFHbs7wja78TYFdDa2+xIRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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