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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316234d809f5ebd050c5dbfaa10e6b889d5ab5c5830dec072d84fcc2e91dd29d' 
  AND token = 'lJm8ZJQWAC1eP5t2tV8YKGGzabfhOaxaT3XbO5ZF9qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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