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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc59c221d15a0b28e5fda4094064be9b7a9a4fce279ef9df7d9dec19c684973' 
  AND token = 'omjnJf63zZU4fXF6HzffA91SdCpnv6RARlI7FMTUDzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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