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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a341be57a8bb54370ad3946d645a02a0375dfe0b5b43b3740c7ee4e9554485' 
  AND token = 'esiUxiyPE0GUFheKKx8Zbt8wMxZk9bTu6fSpwvetVwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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